Why does nobody believe D&C 98? We read the scriptures in the new testament all the time as if we don't have a section of the doctrine and covenants with Christ himself speaking that significantly alters the meaning of the relevant new testament verses. Why is that?
In the new testament there plenty of discussion about heaven and hell. When the vision of the degrees of glory came around it threw far more light on the topic and we have rightly incorporated this greater light and knowledge into our teaching and conversation. We speak of the celestial kingdom more than we use the term heaven.
But with D&C 98 we haven't taken the additional light and knowledge there and made it part of our understanding of what Christ requires of his followers. We still cite the new testament verses it enhances without so much as nod toward it.